Knurl Insert Nut Threaded Round Metric Brass Solid Embedded M2 M2.5 M3 M4

Knurled surface makes nuts embed installed object tightly and stably. Hub Nut Locking Nut DRIVESHAFT NUT CV JOINT HUB NUT Two Nuts a Set M5 - M30. Widely used on the injection moulding for tightly fixing.

eBay